-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2009.1237
             Important: kernel-rt security and bug fix update
                             2 September 2009

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           kernel
Publisher:         Red Hat
Operating System:  Red Hat Enterprise Linux Server 5
Impact/Access:     Increased Privileges   -- Existing Account
                   Denial of Service      -- Existing Account
                   Access Privileged Data -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2009-2848 CVE-2009-2847 CVE-2009-2692
                   CVE-2009-1895  

Reference:         ESB-2009.1214
                   ESB-2009.1215

Original Bulletin: 
   https://rhn.redhat.com/errata/RHSA-2009-1239.html

- --------------------------BEGIN INCLUDED TEXT--------------------

- -----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

=====================================================================
                   Red Hat Security Advisory

Synopsis:          Important: kernel-rt security and bug fix update
Advisory ID:       RHSA-2009:1239-02
Product:           Red Hat Enterprise MRG for RHEL-5
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2009-1239.html
Issue date:        2009-09-01
CVE Names:         CVE-2009-2692 CVE-2009-2847 CVE-2009-2848 
=====================================================================

1. Summary:

Updated kernel-rt packages that fix several security issues and various
bugs are now available for Red Hat Enterprise MRG 1.1.

This update has been rated as having important security impact by the Red
Hat Security Response Team.

[Updated 1st Sep 2009]
This erratum originally stated that these updated kernel packages corrected
the issue CVE-2009-1895. This was a mistake as the kernel packages do not
contain a fix for this issue. CVE-2009-1895 will be addressed in a future 
update.

2. Relevant releases/architectures:

MRG Realtime for RHEL 5 Server - i386, noarch, x86_64

3. Description:

The kernel-rt packages contain the Linux kernel, the core of any Linux
operating system.

These updated packages fix the following security issues:

* Tavis Ormandy and Julien Tinnes of the Google Security Team reported a
flaw in the SOCKOPS_WRAP macro in the Linux kernel. This macro did not
initialize the sendpage operation in the proto_ops structure correctly. A
local, unprivileged user could use this flaw to cause a local denial of
service or escalate their privileges. (CVE-2009-2692, Important)

* it was discovered that, when executing a new process, the clear_child_tid
pointer in the Linux kernel is not cleared. If this pointer points to a
writable portion of the memory of the new program, the kernel could corrupt
four bytes of memory, possibly leading to a local denial of service or
privilege escalation. (CVE-2009-2848, Important)

* a flaw was found in the way the do_sigaltstack() function in the Linux
kernel copies the stack_t structure to user-space. On 64-bit machines, this
flaw could lead to a four-byte information leak. (CVE-2009-2847, Moderate)

This update also fixes the following bugs:

* the gcc flag "-fno-delete-null-pointer-checks" was added to the kernel
build options. This prevents gcc from optimizing out NULL pointer checks
after the first use of a pointer. NULL pointer bugs are often exploited by
attackers, and keeping these checks is considered a safety measure.
(BZ#511187) 

* a bug in the locking strategy for the free_pages_bulk() kernel function
was found, where a lock in a code branch was not held. This could have
created a "double free" problem that resulted in a kernel panic.
(BZ#513715)

* udevd and multipathd were unable to service events fast enough when a
Fibre Channel cable was unplugged. This caused the cable state to be out of
sync if the cable was plugged back in quickly, possibly resulting in
devices being removed, or path issues when using Device-Mapper Multipath.
This has been changed so that users can specify devices that should not be
removed if a cable is unplugged. (BZ#514541)

* a race condition in exit_thread() could have eventually caused a kernel
oops. (BZ#514587)

* a race condition was fixed between kthread_stop() and kthread_create().
Kernel subsystems creating and stopping threads at a fast pace could hit
this issue. Several inexplicable backtraces observed during tests
caused this race condition. (BZ#518967)

* HPET_EMULATE_RTC was being disabled during kernel compile. This was
caused by an incorrect requirement in the related Kconfig entry. This issue
led to failures when accessing the RTC (real time clock) in machines that
had the RTC emulated by HPET (High Precision Event Timer). (BZ#519433)

Users should upgrade to these updated packages, which contain backported
patches to correct these issues. The system must be rebooted for this
update to take effect.

4. Solution:

Before applying this update, make sure that all previously-released
errata relevant to your system have been applied.

This update is available via Red Hat Network.  Details on how to use
the Red Hat Network to apply this update are available at
http://kbase.redhat.com/faq/docs/DOC-11259

5. Bugs fixed (http://bugzilla.redhat.com/):

511187 - kernel: build with -fno-delete-null-pointer-checks [mrg-1]
514541 - [FOCUS] [MRG-1] When the dev_loss_tmo fires don't remove devices by default.
515392 - CVE-2009-2847 kernel: information leak in sigaltstack
515423 - CVE-2009-2848 kernel: execve: must clear current->clear_child_tid
516949 - CVE-2009-2692 kernel: uninit op in SOCKOPS_WRAP() leads to privesc

6. Package List:

MRG Realtime for RHEL 5 Server:

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/RHEMRG/SRPMS/kernel-rt-2.6.24.7-132.el5rt.src.rpm

i386:
kernel-rt-2.6.24.7-132.el5rt.i686.rpm
kernel-rt-debug-2.6.24.7-132.el5rt.i686.rpm
kernel-rt-debug-debuginfo-2.6.24.7-132.el5rt.i686.rpm
kernel-rt-debug-devel-2.6.24.7-132.el5rt.i686.rpm
kernel-rt-debuginfo-2.6.24.7-132.el5rt.i686.rpm
kernel-rt-debuginfo-common-2.6.24.7-132.el5rt.i686.rpm
kernel-rt-devel-2.6.24.7-132.el5rt.i686.rpm
kernel-rt-trace-2.6.24.7-132.el5rt.i686.rpm
kernel-rt-trace-debuginfo-2.6.24.7-132.el5rt.i686.rpm
kernel-rt-trace-devel-2.6.24.7-132.el5rt.i686.rpm
kernel-rt-vanilla-2.6.24.7-132.el5rt.i686.rpm
kernel-rt-vanilla-debuginfo-2.6.24.7-132.el5rt.i686.rpm
kernel-rt-vanilla-devel-2.6.24.7-132.el5rt.i686.rpm

noarch:
kernel-rt-doc-2.6.24.7-132.el5rt.noarch.rpm

x86_64:
kernel-rt-2.6.24.7-132.el5rt.x86_64.rpm
kernel-rt-debug-2.6.24.7-132.el5rt.x86_64.rpm
kernel-rt-debug-debuginfo-2.6.24.7-132.el5rt.x86_64.rpm
kernel-rt-debug-devel-2.6.24.7-132.el5rt.x86_64.rpm
kernel-rt-debuginfo-2.6.24.7-132.el5rt.x86_64.rpm
kernel-rt-debuginfo-common-2.6.24.7-132.el5rt.x86_64.rpm
kernel-rt-devel-2.6.24.7-132.el5rt.x86_64.rpm
kernel-rt-trace-2.6.24.7-132.el5rt.x86_64.rpm
kernel-rt-trace-debuginfo-2.6.24.7-132.el5rt.x86_64.rpm
kernel-rt-trace-devel-2.6.24.7-132.el5rt.x86_64.rpm
kernel-rt-vanilla-2.6.24.7-132.el5rt.x86_64.rpm
kernel-rt-vanilla-debuginfo-2.6.24.7-132.el5rt.x86_64.rpm
kernel-rt-vanilla-devel-2.6.24.7-132.el5rt.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and 
details on how to verify the signature are available from
https://www.redhat.com/security/team/key/#package

7. References:

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-2692
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-2847
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-2848
http://www.redhat.com/security/updates/classification/#important

8. Contact:

The Red Hat security contact is <secalert@redhat.com>.  More contact
details at https://www.redhat.com/security/team/contact/

Copyright 2009 Red Hat, Inc.
- -----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.4 (GNU/Linux)

iD8DBQFKnOlBXlSAg2UNWIIRAq2zAKDBVrpZWK3O7kpSmrPhJd4V2kLX/wCfdJ8z
ojLsMr9PAGI8m+2f1iAurgk=
=j22B
- -----END PGP SIGNATURE-----

- --------------------------END INCLUDED TEXT--------------------

You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.

NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:

        http://www.auscert.org.au/render.html?cid=1980

If you believe that your computer system has been compromised or attacked in 
any way, we encourage you to let us know by completing the secure National IT 
Incident Reporting Form at:

        http://www.auscert.org.au/render.html?it=3192

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967

iD8DBQFKnbDxNVH5XJJInbgRAmMEAJoCvd62ClirFQJOr5EikZNW+N3+4wCfVNQV
cn3NYC4Y5zUXbd9WZrLmtyM=
=TDOt
-----END PGP SIGNATURE-----